| 单词 | pneumatic telegraph |
| 释义 | > as lemmaspneumatic telegraph pneumatic telegraph n. †(a) an early form of telegraph in which a signal was transmitted by means of an impulse given either to a column of water by air pressure or else to one end of a sealed tube of air (obsolete); (b) a pneumatic dispatch system. ΚΠ 1839 Jrnl. Franklin Inst. 24 206 Mr. Crosley's Pneumatic Telegraph... In establishments where the telegraphic communications do not require the constant attendance of a person to observe them,..the signals may be correctly registered on paper, by connecting with..an instrument called a pressure register. a1877 E. H. Knight Pract. Dict. Mech. II. 1755/2 Pneumatic Telegraph, a telegraph used before the times of Morse and Wheatstone for communicating information by the impulse given to a column of water by pneumatic pressure. 1978 R. Grayson Murders at Impasse Louvain xvi. 113 He had sent her..a ‘petit bleu’ or message by the pneumatic telegraph. 1999 Crains Chicago Business (Nexis) 7 June e23 They fed their high-speed T-1 digital telephone lines through the pneumatic telegraph tubes. < as lemmas |
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